The point P lies along the perpendicular bisector of the line connecting two long straight wires S and T perpendicular to the page. A set of directions A through H is shown next to the diagram. When the two equal currents in the wires are directed into the page, the direction of the magnetic field at P is closest to the direction of
a.
E.
b.
F.
c.
G.
d.
H.
e.
A.
e
Physics & Space Science
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Electric Field of Point-Charges: Three equal negative point charges -q are placed at three of the corners of a square of side d as shown in the figure. Which one of the arrows shown represents the direction of the net electric field at the vacant corner of the square?
A. A B. B C. C D. D
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A pair of hydrogen nuclei fused together produces
A) helium. B) lithium. C) beryllium. D) carbon. E) iron.
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In terms of the wavelength of light in soapy water, what is the minimum thickness of soap film that will reflect a given wavelength of light?
A) one-fourth wavelength B) one-half wavelength C) one wavelength D) two wavelengths E) there is no minimum thickness
Physics & Space Science